Insulator.



P. M. FARWELL.

IIIIIIII R.

1,043,9 1 6, Patented Nov. 12, 1912.

Y lllllll/ 1 UNITED srarirsjmraur OFFICE.

rami: M. FABWELL, or KANSAS criar, Missouri.

INSULATOB.

Specification of Letters Patent. i Patented Nov. '12,1912' f Applicationlied October 17, 1911. Serial No. 655,198.

T o all whom it lmay concern:

Be it known that I, FRANK M. FARWELL,

a citizen of the United States, residing at Kansas Cit-y, in the countyof Jackson and State of Missouri, have invented certain new and usefulImprovements in Insulators, of which the following is a specification.

This invention relates to insulators of that class for use with outsidetelegraph andv reference is to be had to the accompanying drawing, inwhich- Figure 1, is a top plan view of the lower portion or base'vof aninsulator embodying myinvention. 'Fig 2, is a central vertical sectionof the complete insulator taken on `the line II-II of Fig. 1, with awire clamped in operative position. Fig. 3, is a side view of the Alowerportion or base of theinsulator. Fig. 4, is a vertical section on theline IV-IV of Fig. 1'.

In the said drawing, 1 is a porcelain or analogous base provided with.an opening 2, and a communicating threaded bore 3, to respectivelyreceive and en age the lower and upper or threaded portions of thecustomary pin, not shown, of the cross arm of a telegraph or telephonepole. The lower part 4 of the base is of substantially conical form andthe upper part 5 also tapers upward slightly, and at the upper end isprovided with a diametric slot or bifurcation 6, which is contracted inwidth at opposite sides of its center, as shown clearly in Fig. 1, theparts 7 of the upper portion 5 which form the sides of the contractedporl tions of the slot or bifurcation, being roundfor the purpose oftending to centralize a telegraph or telephone wire, 12 in the slot orbifurcation, and the slotted or bifurcated portion of the base isexternally screw threaded as at 13. 1

14 is a cap of porcelain or analogous material which is internallythreaded at 15 to engage the threads 13 of the base, and said cap isprovided between its outer margins and sai threads and at ,the lower endof the latter, with a flange 16, which depends below the -outer marginof thev cap and is of rounded form in cross section as shown in Fig. 2,the said Bange when the cap is screwed its full distance on the base, ling in a plane above that of the lower en s of the tapered surfaces 9and said flange is of substantially greater diameter than the npperportion of the base so as to occupy a plane outward of said ortion ofthe base.

To secure a wire r iably in position by means of this insulator, theformer is first slipped down into the slot or bifurcation 6 until itrests upon the boss 10. The cap is then screwed upon the upper end ofthe base until the flange 16 engages the wire. The

latter is then preferably bent downwardly upon the boss by any suitablemeans to substantially the position shown in Fig. 2, and then the cap isscrewed downward until such movement is arrested by engagement with theupper extremity 'of the base, as by bending the wire in the mannerexplained and then screwing the cap down the former is notsubjected to agrinding or cutting action incidenty to the cap being pressed upon itand turned at the same time, though of course the bending of the wirefasexplained may be accomplished by simply screwing the cap down andcausing it to bend the wire as explained.

When the wire and cap occupy the position shown in Fig. 2, the former,it will be observed, is in contact with the insulator at three pointsonly, namely, with the boss and withl the annular depending flange 16 atdiametrically opposite sides of the boss.

With the parts thus arranged it will bev is provided with the daringmouths hereinbefore referred to, as without such Haring mouths the wirein such swaying movements would bev subject to abrasion by contact withcomparatively sharp portions of the base.

In Fig. l the Wire is shown in dotted lines in a position to which itmay sway in gusty weather. It will be observed by reference to Fig. 2,particularly, that the portion of the cap outward of the dependingHarige 16, constitutes in effect a skirt 17 which shields the dependingflange 16 and the wire at the points of contact With-said flange fromthe rain, snow and hail.

From the above description it will be apparent that I have produced aninsulator embodying the features of advantage enumerated as desirableand I wish it to' be understood that while I have illustrated anddescribed the preferred embodiment of the invention I do not desire tobe restricted to the exact details of construction shown and describedas obvious modications will suggest themselves to one 4skilled in theart.

1. An insulator comprising a base provided with a diametric bifurcationin its upper end and tapering upward from opposite sides at the bottomof said bifurcation and provided at the apex of said tapering surfaceswith an upstandingr rounded boss; the slotted or bifurcated portion ofthe base being externally threaded,in combination with an internallythreaded cap to receive the threaded slotted or bifurcated portion, andprovided in a vertical plane between the threads and outer margins ofthe cap'with a depending rounded ange of greater diameter than the baseat the bottom of said slot or bifurcation; the parts being soproportioned that the said flange shall occupy a horizontal plane abovethe lower ends of said tapered surfaces of the base.

2. In an insulator, a base provided with a diametric slot or bifurcationin its upper end and tapered upwardly from opposite sides at the bottomof said bifurcation and provided at the apex of said tapered surfaceswith an upstanding rounded boss; the slotted or bifurcated portion beingexternally threaded.

3. In an insulator, a base having( in its upper end a diametric slot orbifurcation of greatest width at its center, the base at the bottom ofthe slot or bifurcation extending upward from opposite ends of thelatter and formed at the apex of said surface and at the widest point ofthe slot or bifurcation with Aan upstandng rounded boss; the slotted orbifurcated portion of the boss being externally screw-threaded.

In testimony whereof I affix my signature in the presence of twowitnesses.

FRANK M. FARWELL.

